How do I rotate sprite with touch, while keeping original angle?

Hi,

So I'm trying to rotate a sprite with touch, it works... but when I touch the 1st time the sprite "jumps" to certain angle, and I don't want this, I want it to preserve its original angle, and then rotate from there.

Video of the problem:

youtu.be/xCUZyu5YIf8

I'm currently using:

Is touching - set angle to(sprite.X,sprite.Y,Touch.X,Touch.Y)

Thanks!

An easy solution is to use the scene graph feature and use an invisible disk behind the one you want to rotate. When you first click, the invisible disk rotates to that position, then the main disc is added as a child and it rotates with it. When you release touch, the main dis is removed as a child.

demo project 1drv.ms/u/s!AkmrWgxeuxlKhIcaXVGrFuPvCSDuoQ

Check out this demo:

howtoconstructdemos.com/customizable-rotating-knob-controls-capx

Thanks guys you are awesome!